The second picture area still tries to go by the rule of thirds and the composition offers nonetheless more unity than the first example. The objects are overlapping in order to create depth, the focal point quickly shifts from the middle vase to the flowers and follows an implied line down.
The third example is less appealing to the eye since is shows a degree of simmetry. The focal point starts at the flowers, then the areas of interest sought after are in the same vicinity, the implied line seems to go by the pyramidical composition. Some objects overlapping create the illusion of depth while others have touching lines and prove detrimental to the composition.